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Synthesis of a Mg2+-Al3+-SO42−-Hydrotalcite-Type Compound from the acid Wastewaters of the Aluminum-Anodizing Industry

Published online by Cambridge University Press:  01 January 2024

E. Álvarez-Ayuso  and
H. W. Nugteren
E. Álvarez-Ayuso*
Affiliation:
Department of Chemical Technology, Faculty of Applied Sciences, Delft University of Technology, Julianalaan 136, 2638 BL Delft, The Netherlands
H. W. Nugteren
Affiliation:
Department of Chemical Technology, Faculty of Applied Sciences, Delft University of Technology, Julianalaan 136, 2638 BL Delft, The Netherlands
*
*E-mail address of corresponding author: [email protected]
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Abstract

The synthesis of a Mg2+-Al3+-SO2−4-hydrotalcite-type compound from the acid wastewaters of the aluminum-anodizing industry has been studied as a possible means of recovering the unused Al resource materials as a useful mineral. The synthesis has been carried out from wastewaters of different concentrations (from 6.7 g Al/L to 134 mg Al/L) using the method of precipitation at constant pH, proving that all of them are suitable for such a process. The mineral was characterized using X-ray diffraction, Fourier transform infrared spectroscopy, thermogravimetric analysis, differential thermal analysis and chemical analysis, all of which indicated characteristics typical of the desired compound. Almost 100% of the Al initially present in the wastewater solutions is recovered in the form of the Mg2+-Al3+-SO42−-hydrotalcite-type compound.

Keywords

AluminumAnodizingHydrotalciteRecoveryWastewaters
Type
Research Article
Information
Clays and Clay Minerals , Volume 53 , Issue 1 , February 2005 , pp. 11 - 17
Copyright
Copyright © Clay Minerals Society 2005

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